I have found a 1943 American dime and am trying to ascertain its value

I have read this dime could be valuable

https://www.ngccoin.com/price-guide/united-states/dimes/31/

Hello and welcome to Numista!

A 1943 dime regardless of mint is not extremely valuable. Depending on grade, in the neighborhood of 3 to 5 USD, more in an MS60 or above grade. If you go to the coin page and click on the year on the left you'll get an idea of its value.

https://en.numista.com/catalogue/pieces51.html

the only MErcury dime that is valuable is 1916D

a word about the NGC guide,
there are two pages one for Proof issues and one for regular mint strike issues,
you might have to toggle this tool -

In average circulated condition, it's worth $1.62 (silver @ 22.37/oz).